The Douglas DC-4 is an American four-engined, propeller-driven airliner developed by the Douglas Aircraft Company. Military versions of the plane, the C-54 and R5D, served during World War II, in the
AerolĂneas Argentinas DC-4 starting engines at Buenos Aires international airport in 1958
Pan American DC-4 in flight
The Lockheed L-049 Constellation is the first model of the Lockheed Constellation aircraft line. It entered service as the C-69 military transport aircraft during World War II for the United States Ar
A Trans World Airlines L-049 Constellation in flight
Prototype XC-69, circa 1943
The Wright R-3350 Duplex-Cyclone was the troubled powerplant of the Constellation and caused delays in the development of the aircraft.
A Pan American World Airways L-049 Constellation at London Heathrow International Airport.